resetting Karaf + Bundles after a shutdown.

[Mike van Geertruy <mv...@comcast.net>]

Hey folks, I have 2 questions, for my OSGi app containing over 130 bundles
with many delicate intricacies.

 

1)        After I shut down Karaf, after installing my full set of my
bundles, and then starting it up again, I got a massive hang. Hell, its
still hanging 6 hours later.  Is Karaf really ready for prime-time?  I think
the problem is that there are a number of dependencies between apps, and
Karaf 1.6.0 doesn't appear to be able to handle them.

2)      Is there a way to install bundles programmatically in an ordered
fashion?  Kind of like the way features are installed, where all
dependencies are noted and installed.

3)      Yeah, I said 2, but heck, what's the issue with an additional
question?  How does karaf stack up against equinox when facing the above 2
issues?

 

Mike Van (lots of post-name certs), WTF?

Re: resetting Karaf + Bundles after a shutdown.

["Richard S. Hall" <he...@ungoverned.org>]

  On 8/5/10 1:18, Mike van Geertruy wrote:
> Hey folks, I have 2 questions, for my OSGi app containing over 130 bundles
> with many delicate intricacies.
>
>
>
> 1)        After I shut down Karaf, after installing my full set of my
> bundles, and then starting it up again, I got a massive hang. Hell, its
> still hanging 6 hours later.  Is Karaf really ready for prime-time?  I think
> the problem is that there are a number of dependencies between apps, and
> Karaf 1.6.0 doesn't appear to be able to handle them.

To be clear, if there is a "hang" due to dependencies, then it would be 
because of the Felix framework, not because of Karaf, since Karaf is a 
layer on top of the framework...perhaps you could try to use jstack to 
get a stack dump of your system to get a better idea of what is going on.

130 bundles is a few, but not necessarily huge. GlassFish is growing 
toward 250 without significant issue, so 130 should be possible.

I am not sure which version of the Felix framework Karaf is using, but 
the 3.0.x release of the framework saw a complete rewrite of the 
resolver. The old resolver could get into trouble in some scenarios that 
the new resolver seems to do a better job with.

> 2)      Is there a way to install bundles programmatically in an ordered
> fashion?  Kind of like the way features are installed, where all
> dependencies are noted and installed.

You can use the OSGi API.

> 3)      Yeah, I said 2, but heck, what's the issue with an additional
> question?  How does karaf stack up against equinox when facing the above 2
> issues?

Good question. You can run Karaf on Equinox to find out, I believe.

With the 3.0.x release of the Felix framework, it does a better job (in 
some cases a lot better) on complicated scenarios than Equinox, but I've 
not done much testing on the average case. With Felix framework 2.0.x, 
there are definitely scenarios where it performs a lot worse than Equinox.

-> richard

>
>
> Mike Van (lots of post-name certs), WTF?
>
>

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